45
Section 4 - Maintenance
4.4 Wear Brush Replacement
The Ground Hog wear brush bristles will slowly
wear during operation. Consequently, the wear
brush will require adjustment periodically to keep
the bristles in contact with the pavement to pro-
vide proper vacuum air flow. It will also need to
be adjusted when the shroud and/or wear brush
is replaced.
Use the following procedure to adjust the
wear brush assembly:
1. Shutdown the power system and place it in
the service position.
2. Note the gap between the bottom of the brush
and the surface.
3. Loosen the brush clamp on the blast head.
4. Tap the brush down evenly using a dead blow
hammer until the bristles are just touching the
surface and the gap is eliminated.
5. Make sure the brush bristles are not pressed
hard against the pavement. If the brush is
set too tight against the surface, it will cause
premature wear to the bristles resulting in
reduced vacuum air flow and accelerated
brush wear.
6. Tighten the clamp and recheck. Readjust if
necessary.
Use the following procedure to replace the
wear brush assembly:
1. Shutdown the power system and place it in
the service position.
2. Tilt the Ground Hog on its side and support it.
3. Loosen the wear brush clamp on the blast
head.
4.
Work the existing brush off the blasting head
shroud.
Typical Hog Tool Blasting Head Shroud
& Wear Brush Assembly
5. Slide the new brush assembly onto the shroud
and snug the clamp.
6. Rotate the Ground Hog so it is resting on the
wheels.
7. Loosen the clamp and tap the brush down
evenly using a dead blow hammer until the
bristles are just touching the surface and the
gap is eliminated.
8. Make sure the brush bristles are not pressed
hard against the pavement. If the brush is
set too tight against the surface, it will cause
premature wear to the bristles resulting in
reduced vacuum air flow and accelerated
brush wear.
9. Tighten the clamp and recheck. Readjust if
necessary.
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